X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/e342c3beaf9d73616e8ff6fe005b97f3a72c0476..89519adfbef077ae28b34d2b04e3e688ae05399f:/NEWS?ds=sidebyside diff --git a/NEWS b/NEWS index ddf58473..ac3587eb 100644 --- a/NEWS +++ b/NEWS @@ -1,63 +1,95 @@ Bison News ---------- -Changes in version 1.875e: +Changes in the next version (not yet released): -* New directive: %initial-action. - This directive allows the user to run arbitrary code (including - initializing @$) from yyparse before parsing starts. +* Bison-generated parsers now support the translation of diagnostics like + "syntax error" into languages other than English. The default + language is still English. For details, please see the new + Internationalization section of the Bison manual. Software + distributors should also see the new PACKAGING file. Thanks to + Bruno Haible for this new feature. -* The option `--report=lookahead' was changed to `--report=look-ahead'. - The old spelling still works, but is not documented and will be - removed. +* Wording in the Bison-generated parsers has been changed slightly to + simplify translation. In particular, the message "memory exhausted" + has replaced "parser stack overflow", as the old message was not + always accurate for modern Bison-generated parsers. -* Error token location. - During error recovery, the location of the syntax error is updated - to cover the whole sequence covered by the error token: it includes - the shifted symbols thrown away during the first part of the error - recovery, and the lookahead rejected during the second part. +* Destructors are now called when the parser aborts, for all symbols left + behind on the stack. Also, the start symbol is now destroyed after a + successful parse. In both cases, the behavior was formerly inconsistent. -Changes in version 1.875d, 2004-05-21: +The following change was also in version 2.0a, 2005-05-22: -* Unescaped newlines are no longer allowed in character constants or - string literals. They were never portable, and GCC 3.4.0 has - dropped support for them. Better diagnostics are now generated if - forget a closing quote. +* When generating verbose diagnostics, Bison-generated parsers no longer + quote the literal strings associated with tokens. For example, for + a syntax error associated with '%token NUM "number"' they might + print 'syntax error, unexpected number' instead of 'syntax error, + unexpected "number"'. -* NUL bytes are no longer allowed in Bison string literals, unfortunately. +Changes in version 2.0, 2004-12-25: -* %token numbers can now be hexadecimal integers, e.g., `%token FOO 0x12d'. - This is a GNU extension. +* Possibly-incompatible changes -* A new directive "%expect-rr N" specifies the expected number of - reduce/reduce conflicts in GLR parsers. + - Bison-generated parsers no longer default to using the alloca function + (when available) to extend the parser stack, due to widespread + problems in unchecked stack-overflow detection. You can "#define + YYSTACK_USE_ALLOCA 1" to require the use of alloca, but please read + the manual to determine safe values for YYMAXDEPTH in that case. -* Experimental %destructor support has been added to lalr1.cc. + - Error token location. + During error recovery, the location of the syntax error is updated + to cover the whole sequence covered by the error token: it includes + the shifted symbols thrown away during the first part of the error + recovery, and the lookahead rejected during the second part. -Changes in version 1.875c, 2003-08-25: + - Semicolon changes: + . Stray semicolons are no longer allowed at the start of a grammar. + . Semicolons are now required after in-grammar declarations. - (Just bug fixes.) + - Unescaped newlines are no longer allowed in character constants or + string literals. They were never portable, and GCC 3.4.0 has + dropped support for them. Better diagnostics are now generated if + forget a closing quote. -Changes in version 1.875b, 2003-06-17: + - NUL bytes are no longer allowed in Bison string literals, unfortunately. -* GLR grammars now support locations. +* New features -* Semicolon changes: - - Semicolons are now allowed before "|" in grammar rules, as POSIX requires. - - Stray semicolons are no longer allowed at the start of a grammar. - - Semicolons are now required after in-grammar declarations. + - GLR grammars now support locations. + + - New directive: %initial-action. + This directive allows the user to run arbitrary code (including + initializing @$) from yyparse before parsing starts. + + - A new directive "%expect-rr N" specifies the expected number of + reduce/reduce conflicts in GLR parsers. + + - %token numbers can now be hexadecimal integers, e.g., `%token FOO 0x12d'. + This is a GNU extension. + + - The option `--report=lookahead' was changed to `--report=look-ahead'. + The old spelling still works, but is not documented and will be + removed. -Changes in version 1.875a, 2003-02-01: + - Experimental %destructor support has been added to lalr1.cc. -* For now, %expect-count violations are now just warnings, not errors. - This is for compatibility with Bison 1.75 and earlier (when there are - reduce/reduce conflicts) and with Bison 1.30 and earlier (when there - are too many or too few shift/reduce conflicts). However, in future - versions of Bison we plan to improve the %expect machinery so that - these violations will become errors again. + - New configure option --disable-yacc, to disable installation of the + yacc command and -ly library introduced in 1.875 for POSIX conformance. -* New configure option --disable-yacc, to disable installation of the - yacc command and -ly library introduced in 1.875 for POSIX conformance. +* Bug fixes + + - For now, %expect-count violations are now just warnings, not errors. + This is for compatibility with Bison 1.75 and earlier (when there are + reduce/reduce conflicts) and with Bison 1.30 and earlier (when there + are too many or too few shift/reduce conflicts). However, in future + versions of Bison we plan to improve the %expect machinery so that + these violations will become errors again. + + - Within Bison itself, numbers (e.g., goto numbers) are no longer + arbitrarily limited to 16-bit counts. + + - Semicolons are now allowed before "|" in grammar rules, as POSIX requires. Changes in version 1.875, 2003-01-01: @@ -229,7 +261,8 @@ Changes in version 1.50, 2002-10-04: allowed some non-error action other than a default reduction on the error token. The new behavior has long been the documented behavior, and has long been required by POSIX. For more details, please see - . + Paul Eggert, "Reductions during Bison error handling" (2002-05-20) + . * Traces Popped tokens and nonterminals are now reported. @@ -586,7 +619,7 @@ End: ----- -Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 +Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. This file is part of Bison, the GNU Compiler Compiler. @@ -603,5 +636,5 @@ GNU General Public License for more details. You should have received a copy of the GNU General Public License along with autoconf; see the file COPYING. If not, write to -the Free Software Foundation, Inc., 59 Temple Place - Suite 330, -Boston, MA 02111-1307, USA. +the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, +Boston, MA 02110-1301, USA.